One of the curved structural elements forming the frame of a ship or (in later use) an automobile, etc.; = sense A. 5f.
Early 18th century; earliest use found in William Sutherland (fl. 1711–1717).
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。